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My '01, RS needed 11 shims at 13k miles, two of the intakes would not take a .04mm gage. Most of my miles are mountain roads, 1st and 2nd gear, and often at the upper end of the power band. NO way would the valves have made it to 18k miles, much less 24k miles. If you ride easy, keeping revs3-4k rpms,mostly commute or hi way miles at lower revs, 12k miles and 24k miles might work for the valves, if you ride it on the motor on tight roads, 6-8k miles will keep the valves in spec.
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